npm · next-video
next-video: Unauthenticated arbitrary file read via /api/video request handler
The HTTP route handler exported by next-video/request-handler — which the README instructs consumers to mount at /api/video — allows an unauthenticated remote attacker to read arbitrary .json files from the production filesystem of any application following the documented setup.
The handler's GET endpoint accepts a url query parameter and uses it to locate and serve a JSON asset descriptor from disk. The only guard between "remote URL" and "local file path" is a regex check for ^https?://. Any value that does not match that prefix is treated as a local path, .json is appended, and the file is read with fs.readFile and returned in the HTTP response — with no authentication, no path canonicalization, and no traversal guard.
On a typical Next.js deployment this exposes, at minimum:
.next/server/server-reference-manifest.json)previewModeId, previewModeSigningKey, previewModeEncryptionKey)uploadId, assetId, playbackId values stored in videos/*.json)Any application that mounted /api/video following the documented one-liner is affected.
2.8.1
Until a patched version is available, wrap the exported handler in your own route file and validate the url parameter before passing it through:
url value that does not begin with https://, or that does not match a known allowlist of trusted remote hosts./api/video route entirely if your application only uses build-time import of local video files and does not use <Video src="https://..."> with string URLs at runtime.src/request-handler.ts — the vulnerable GET handlersrc/assets.ts — getAssetPath(), where the local-vs-remote branching occurssrc/utils/utils.ts — isRemote(), the sole guard between the two branchessrc/config.ts — loadAsset(), which performs the unconstrained fs.readFileIs your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.
Check my repoSources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.